Blanking die and method of making the same



Feb. 12, 19290 1,701,545

c. P. SHAW BLANKING DIE AND METHOD OF MAKING THE SAME Filed Oct. '6, 1926 2 Sheets-Sheet l INVENTOR. 6%47229 7415724212 flaw V A TTORNE Y.

Feb. 12, 1929.

C. P. SHAW BLANKING DIE AND METHOD OF MAKING THE SAME Filed Oct. 6. 1 926 2 Sheets-Sh eet 2 I INVENTOR.

ATTORNEY.

Patented Feb. 12, 1929.

I ED STATES {PATENT OFFICE,

cinemas r. straw, or person, MICHIGAN.

Brahma-DIE AND murnonior MAKING ran semen.

Application filed October 6.19%. Serial, No. 139,8?8.

Heretofore punches and dies havebeenmade separately out of hard die steel. This practice is expensive, owing to the fact that both the punch and the die must be machined with great care, which involves conslderable time and labor and, moreover, due to the fact that the punch and the die are madeseparately, errors are frequently made, resulting in an imperfect fit between the two members. When this occurs, the imperfect member, or both members, cannot be used,

and new members must be made at an additional loss of time and labor.

The present invention aims to provide blanking dies, and a method of making such dies, so as to overcome these objections. According to the invention the punch and the die are made simultaneously, so that one opv eration forms both members thus insuring that the members are perfect with respect to each other. Both the punch and the die are made from relatively. soft metal, as compared with the die steel heretofore used, a cutting edge is used in conjunction with .the relatively soft metal. This cutting edge may be in the form of a hard steel rule placed around the edges of the die so as to co-opsn ate with the punch. The use of the relatively soft metal is advantageous in that the metal may be peened over to correct an inaccurate placement of the cutting rule.

The invention will be better understood by reference to the accompanying drawings wherein:

l is a plan view of apiece of metal showing how the punch is out out fromthe metal.

Fig. 2 shows the metal which remains after the punch is removed, which is to be used asthe die, the die being severed approximate- Fig. 6 is an enlarged detail showing the manner in which the metal is peeued over to accurately position the rule. I Fig. 7 is a sectional view taken through the punch and die showing how the die is filled in with material after the punch is removed.

The invention can probably be best described by considering the manner in which a die and punch are made. In Fig. l a piece of metal of a desired material, such as steel, 1

is shown at 1. The desired design is cut out of this piece of metal by means of a saw or a routing machine. For this purpose. holes 2 are drilled through the metal so as to afford starting places for the saw. in this manner, square corners as shown at 3, may be obtained. The use of such holes to provide several starting places for the saw is necessary with such a design as is shown, al-

though in many cases the design will be E;

such that only one starting place will need to be provided, and the complete operation of sawing out the design may be made without again starting the saw.

After the design has been out out of the metal, the cut out part 5 is removed, and this is to be used as a punch. The remaining metal is to be used as a die and, since the metal is relatively soft, a cutting rule is to be used,

F or the purpose of placing the cutting rule in the die, the die may be severed in two, as shown in Fig. 2, thus forming two sections 8 and 7. A cutting rule 8 is placed around the edges of the members 6 and 7 formed by the cut out. This rule is bent to conform with the outlines of the die, and can be so bent while it is relatively soft. After the rule is bent and the die is otherwise completed, the rule may be hardened. The operation of hardening the rule is relatively short, due to the fact that the rule is not of thick material, and the hardening operation does not harden the members 6 and 7 materially because of their large volume of fit as between the cutting rule and the punch f is obtained. After the rule is shaped the two members 6 and 7 are brought together and secured, as shown in Fig. 5, and a workable material'such as soft metal or Wood is placed within the rule as shown at 10 (Fig. 7 to hold it in place. This soft metal need not be so thick as the members 6 and 7.

. The members are now ready to be used as a punch and die. The punch 5 can be secured to a suitable supporting base or structure (not shown), and-the die formed by the members 6 and 7 and the rule can also be bolted or otherwise secured to a support or base (not shown). For this purpose the holes 2 which are drilled in the metal 1 may be used for bolts. In the use of a device, as indicated in Fig. 7, a suitable stripper may be provided for stripping the blanked out form from inside the cutting rule. This stripper may be in the form of a spring pressed metallic plate or in the form of a compressible rubber layer, both of which are well known in the art.

In case of inaccuracies in the position of the rule, the relatively soft metal of the members 6 and 7 can be peencd over, as shown at 11 in Fig. 6, so as to correct an inaccurate position of the rule. Likewise. should it be necessary to correct the punch, the metal of the punch may he peened over, as shown at 12.

In making a punch and die by the use of a number of starting holes as shown in Fig. 1, it is desirable that these holes be removed from the edge of either member so that the metal is not materially weakened adjacent the edge. Such holes are not used for bolts, or all of the holes, if desired, can be-filled in with the soft metal or wood, and the kerf between these holes and the design may be filled in with rule. While it is perhaps preferable and advantageousto divide the die into two parts, as shown in Fig. 9., for the purpose of expediting the placing of the rule, this is not necessary, especially where the die is not of irregular configuration. In some cases it may be desirable to finish the sides of the saw kerf. This would make the finished kerf somewhat wider, and the rule which is to be used is substantially as thick as the width of the finished saw kerf.

I claim:

1. A blanking die comprising a punch and a die which are formed by one operation of cutting the shape to be blanked from a single piece of metal, and a cutting rule fitted around the edges of the die.

2. A blanking die comprising a punch and a die which are formed by cutting the shape to be blanked from a single piece of metal,

and a cutting rule fitted around the edges of the die, said rule being of a thickness substanti ally equal to the kerf formed by the cutting tool. 7

3. A blanking die comprising a punch and a die which are formed by cutting the shape to be blanked from a single piece of metal, and a cutting rule fitted around the edges of the die, said rule being of a thickness substantially equal to the kerf formed by the cutting tool, and of a width which is greater than the thickness of the metal.

4. A blanking die comprising a punch and a die which are formed simultaneously by cutting the shape to be blanked from a single piece of metal, a cutting rule fitted around the edges of the die, said rule being of a thickness substantially equal to the kerf formed by the cutting tool, and of a width which is greater than the thickness of the metal, and a filler for holding the rule in place.

5. A blanking die comprising a punch and a die which are formed simultaneously by cutting-the shape to be blanked from a single piece of metal, a cutting rule fitted around the edges of the die, said rule being of a thickness substantially equal to the kerf formed by the cutting tool, and a filler for holding the rule in place.

6. A blanking die comprising a punch and a die which are formed by cutting the shape to be blanked from a single piece of metal, and acutting rule fitted around the edges of the die, the-metal of the die being peened over to correct the position of the rule.

7. The method of making blanking dies which comprises, cutting the shape to be blanked from a piece of metal, removing the cut out piece, placing a cutting rule around the edges of the aperture left by the removal of the cut out piece, and using the cut out piece and the remaining metal as a punch and a die respectively.

8. The method of making blanking dies:v

which comprises, cutting the shape to be blanked from a piece of metal, removing the cut out piece, placing a cutting rule of a thickness substantially equal to the kerf formed by the cutting tool around the edges of the aperture left by the removal of the cut out piece, and using the cut out piece and the remaining metal together with the rule as a punch and a die respectively.

9. The method of makin blanking dies which comprises, cutting t e shape to be I blanked from a piece of metal, removing the cut out piece, placing a cutting rule around the edges of the aperture left by the removal of the cut out piece, partially filling in the aperture now bounded by the rule with a workable material, and using the cut out piece and the remaining metal as a punch and a die respectively.

10. The method of making blanking dies which comprises, cutting the shape to be blanked from a piece of metal, removing the cut out piece, placing acutting rule around the edges of the aperture left b the removal of the cut out piece, partially fil ing the aperture now bounded by the rule with soft metal,

and using the cut out piece and the remaining metal as a punch and a die respectively.

11 The method of making blanking dies neonate which comprises, cutting the shape to he blanked out of a piece of metal, removing the cut out piece, placing a cutting rule around the edges of the aperture left by the removal of the cut out piece, partially filling in the aperture now hounded by the rule, and peening over the metal adjacent the rule to position the same, and using the cut out piece and remaining metal as a punch and a die respectively.

12. The method of making blanking dies which comprises, cutting the shape to he blanked out of a piece of metal, removing the cut out piece, placing a rule in the kerf formed by the cutting tool, positioning the rule by peening over the metal adjacent thereto, and using the cut out piece and. the remaining metal as a punch and a die respectively.

13. The method of making blanking dies which comprises, cutting the shape to he blanked out of a piece of metal, removing the cut out piece, severing the remaining metal, fitting a cutting rule around the edge of each severed piece, placing the pieces together and using the cut out piece and the said two pieces as a punch and a die respectively.

ll. The method of making blanking dies which comprises, cutting the shape to be blanked from a piece of metal, removing the cut out piece, and placing a cutting rule around the edges of the aperture left by the removal of the cut out piece.

15. The method of making. blanking dies which comprises, cutting the shape to he blanked from a piece of metal, removing the cut out piece, and placing a cutting rule of a thickness substantially equal to the kert formed by the cutting tool around the edges piece. 16. The method of making blanking dies which comprises, cutting the shape to he hla-nked from a piece of metal, removing the of the aperture left by the removal of the cut out 

